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The Stage 4 System is for those wanting maximum performance and  capability without sacrificing ride quality. It carries over the quality  components of the Stage 3 System, but improves upon them by swapping  out the Standard Length Control Arms for Adjustable Long Arms and Long  Arm Mounting Brackets. This is a 100% bolt on system with no welding  required. This system will fit 37" tires with stock fenders or 40" tires  with high fenders. 

Fits: 07-current JK (4-Door Only)